Hydrogen Bonded Supramolecular Elastomers: Correlating Hydrogen Bonding Strength with Morphology and Rheology
Hydrogen Bonded Supramolecular Elastomers: Correlating Hydrogen Bonding Strength with Morphology and Rheology
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DOI：
10.1021/ma9027646
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发表时间：
2010-02
期刊：
影响因子：
5.5
通讯作者：
P. Woodward;D. Merino;B. W. Greenland;I. Hamley;Zoe Light;A. Slark;W. Hayes
中科院分区：
文献类型：
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作者：
P. Woodward;D. Merino;B. W. Greenland;I. Hamley;Zoe Light;A. Slark;W. Hayes
设计、合成了六种具有氢键端基的低分子量弹性体。基于聚（氨基甲酸酯）的弹性体都含有基本上相同的硬嵌段含量（约10%）。11%），仅在其端基的性质上有所不同。具有端基的模型化合物的溶液状态1H NMR光谱分析表明，它们都表现出非常低的结合常数，在1.4至45.0 M-1的范围内，在CDCl 3，但相应的弹性体各自具有显着不同的纳米级形态和流变性的散装。我们能够将端基结合常数的微小变化与弹性体的本体性质的巨大变化相关联。这些结果提供了重要的洞察力的方式，其中弱的非共价相互作用可以被利用，以提供一系列的自组装的基于聚硅氧烷的材料，具有不同的形态。
A series of six low-molecular-weight elastomers with hydrogen bonding end groups have been designed, synthesized, and studied. The poly(urethane)-based elastomers all contained essentially the same hard block content (ca. 11%) and differ only in the nature of their end groups. Solution-state 1H NMR spectroscopic analysis of model compounds featuring the end groups demonstrates that they all exhibit very low binding constants in the range of 1.4 to 45.0 M-1 in CDCl3, yet the corresponding elastomers each possess a markedly different nanoscale morphology and rheology in the bulk. We are able to correlate small variations of the binding constant of the end groups with dramatic changes in the bulk properties of the elastomers. These results provide important insight into the way in which weak noncovalent interactions can be utilized to afford a range of self-assembled polyurethane-based materials that feature different morphologies.